check out RC Planet and look for the Mini Ultra Stick. Or the Ultra Stick 25e. It's an electric "stick" plane that's pretty small, but VERY fun to fly! The "Ultra" series can be rigged with flaps so you can "crow" it (flaps up, ailerons down)

If you're looking for MICRO sized craft Kyosho just came out with a Piper Cherokee that comes as RTF and it's under 20" wingspan (like the Micro Citabria and the Micro Cessna) BUT this one from Kyosho is completely unique - it has fully functional "scale" ailerons making it an ACTUAL micro sized 4 channel flyer. I think it's selling for $179 complete with controller, battery, motor, esc, etc.... all packed up. Basically you take it out of the box and plug it in and in about an hour, you're ready to go.

Other "small" 4 channel planes that are fairly inexpensive are the ParkZone T28 Trojan RTF and the ParkZone Corsair RTF. Both are a TOTAL blast to fly and I haven't found ANYONE who regrets buying one. They're just PLAIN FUN ! (and remarkably agile too). These cost about $250 and also come with EVERYTHING you need including a controller + battery that actually has High and Low throw settings! (I was really shocked to see this feature on a "buget" controller). They're NICE planes and right about the size you're looking for. You can just toss it in the back seat (or passenger seat they're so small) and get out whereever you are and fly! No hassle and no extra "field equipment" needed.